Math, asked by namitaji041048, 6 months ago


2. (i) /a আৰু bৰ কি মানৰ ক্ষেত্ৰত তলৰ ৰৈখিক সমীকৰণ যােৰৰ অসীম সংখ্যক সমাধান
K থাকিব?
2x + 3y = 7
(a – b) x + (a + b) y = 3a + b - 2
/ii) ৰ কি মানৰ ক্ষেত্ৰত তনৰ বৈকি সমীকরণযােৰৰ কোনাে সমাধান নাই?​

Answers

Answered by deepakpaniwala1980
2

2x+3y=7

ax−bx+ay+by=3a+b−2

(or) 2x+3y=7 …………(1)

(a−b)x+(a+b)y=3a+b−2 ………….(2)

Given: the pair of linear equations have infinite number of solutions

a−b

2

=

a−b

3

=

3a+b−2

7

a−b

2

=

a+b

3

a+b

3

=

3a+b−2

7

⇒2a+2b=3a−3b

⇒−a=−5b

∴a=5b

3(3a+b−2)=7(a+b)

9a+3b−6=7a+7b

2a−4b−6=0

a−2b=3

Put a=5b in a−2b=3 we get

5b−2b=3

⇒3b=3

or b=1

∴a=5×1=5, b=1

Hence a=5,b=1.

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ANSWER

2x+3y=7

ax−bx+ay+by=3a+b−2

(or) 2x+3y=7 …………(1)

(a−b)x+(a+b)y=3a+b−2 ………….(2)

Given: the pair of linear equations have infinite number of solutions

a−b

2

=

a−b

3

=

3a+b−2

7

a−b

2

=

a+b

3

a+b

3

=

3a+b−2

7

⇒2a+2b=3a−3b

⇒−a=−5b

∴a=5b

3(3a+b−2)=7(a+b)

9a+3b−6=7a+7b

2a−4b−6=0

a−2b=3

Put a=5b in a−2b=3 we get

5b−2b=3

⇒3b=3

or b=1

∴a=5×1=5, b=1

Hence a=5,b=1.

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